Patents by Inventor Frederick J. Murrell

Frederick J. Murrell has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Gasification of fuel in a slagging gasifier
    Publication number: 20080110090
    Abstract: A process for gasification of carbon-containing fuel is taught. The process includes heating carbon-containing fuel in a container, introducing air into the container in controlled quantifies to maintain substoichiometric conditions; removing syngas from the container and, removing slag from the container.
    Type: Application
    Filed: November 15, 2006
    Publication date: May 15, 2008
    Inventors: Edward Zawadzki, William Britton, Herbert Ligon, Frederick J. Murrell, John Simmons
  • Low nitrogen oxides emissions from carbonaceous fuel combustion using three stages of oxidation
    Patent number: 6325003
    Abstract: A method for reducing NOx emissions from the combustion of carbonaceous fuels using two sequential stages of partial oxidation followed by a final oxidation stage. In the first stage, substoichiometric air condition of about 0.55 to 0.75 is used in a plug flow fashion, while second stage combustion is performed at a stoichiometric ratio of about 0.80 to 0.99. As the second stage combustion products are cooled by radiant heat transfer to the boiler furnace walls, overfire air is added to produce an stoichiometric ratio of about 1.05 to 1.25 to complete the combustion process. In this manner, the formation of thermal NOx is reduced.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: December 4, 2001
    Assignee: Clearstack Combustion Corporation
    Inventors: Robert Ashworth, Frederick J. Murrell, Edward A. Zawadzki